It's a British expression so it might not be understood globally, especially where British English isn't common.

British Slang

It doesn't mean a physical fall, but a figurative one related to making mistakes or failing tasks.

Not Literal

Used to describe a situation with a poor or undesirable result, not a minor inconvenience.

Refers to an actual, not metaphorical, tumble or fall, often due to a mistake or carelessness.

Often linked to accidents or unexpected mishaps that result in falling down.

It can convey humor or a light-hearted view towards the misfortune of falling.